1994 Chevrolet G Series Van (G30) Questions

All 1994 Chevrolet G Series Van (G30) Questions

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I can drive to about 35 miles per hour but not more .... What can be the problem , please ? I have driven about 200 miles like this .... I also noticed that the fuel consumption is very bad .... C...
on the gage should it be on 19 or 9 for a good charge